Data transmission method, terminal device and network device

1. A method for data transmission, comprising:

acquiring, by a terminal device, multiple Sounding Reference Signal (SRS) Resource Indications (SRIs) from Downlink Control Information (DC) scheduling uplink data, each of the multiple SRIs corresponding to at least one power control parameter;

determining, by the terminal device, a first beam for transmission of the uplink data;

determining, by the terminal device, a first SRS resource for transmitting an SRS via a same beam as the first beam;

determining, by the terminal device, an SRI corresponding to the first SRS resource from the multiple SRIs as a target SRI;

determining, by the terminal device, a power control parameter for the uplink data according to the at least one power control parameter corresponding to the target SRI; and

determining, by the terminal device, transmit power of the uplink data according to the power control parameter for the uplink data.

2. The method of claim 1 , wherein the uplink data comprises part of data in uplink data carried in a Physical Uplink Shared Channel (PUSCH) scheduled by the DCI.

3. The method of claim 2 , wherein the uplink data carried in the PUSCH comprises data of N transmission layers, and the uplink data comprises data of M transmission layers in the N transmission layers, N>M>0.

4. The method of claim 3 , wherein the target SRI corresponds to the data of the M transmission layers.

5. The method of claim 1 , before determining, by the terminal device, the SRI corresponding to the first SRS resource from the multiple SRIs as the target SRI, further comprising:

receiving, by the terminal device, correspondence information sent by the network device, the correspondence information comprising a correspondence between each of the multiple SRIs and at least one power control parameter.

6. The method of claim 1 , wherein determining, by the terminal device, the power control parameter for the uplink data according to the at least one power control parameter corresponding to the target SRI comprises:

determining, by the terminal device, the at least one power control parameter corresponding to the target SRI as the power control parameter for the uplink data.

7. The method of claim 1 , wherein the target SRI is multiple second SRIs of the multiple SRIs, and

determining, by the terminal device, the power control parameter for the uplink data according to the at least one power control parameter corresponding to the target SRI comprises:

determining, by the terminal device, the power control parameter for the uplink data based on processing of multiple power control parameters corresponding to the multiple second SRIs.

8. A terminal device, comprising:

an acquisition unit, configured to acquire multiple Sounding Reference Signal (SRS) Resource Indications (SRIs) from Downlink Control Information (DCI) scheduling uplink data, each of the multiple SRIs corresponding to at least one power control parameter; and

a processing unit, configured to:

determine a first beam for transmission of the uplink data;

determine a first SRS resource for transmitting an SRS via a same beam as the first beam;

determine an SRI corresponding to the first SRS resource from the multiple SRIs as a target SRI,

determine a power control parameter for the uplink data according to the at least one power control parameter corresponding to the target SRI and

determine transmit power of the uplink data according to the power control parameter for the uplink data.

9. The terminal device of claim 8 , wherein the processing unit is configured to:

determine the SRI, corresponding to an SRS resource having a quasi-co-location relationship with the uplink data, of the multiple SRIs as the target SRI.

10. The terminal device of claim 8 , wherein the uplink data comprises part of data in uplink data carried in a Physical Uplink Shared Channel (PUSCH) scheduled by the DCI.

11. The terminal device of claim 10 , wherein the uplink data carried in the PUSCH comprises data of N transmission layers, and the uplink data comprises data of M transmission layers in the N transmission layers, N>M>O.

12. The terminal device of claim 11 , wherein the target SRI corresponds to the data of the M transmission layers.

13. The terminal device of claim 8 , wherein the acquisition unit is further configured to:

before the SRI corresponding to the first SRS resource from the multiple SRIs is determined as the target SRI, receive correspondence information sent by the network device, the correspondence information comprising a correspondence between each of the multiple SRIs and at least one power control parameter.

14. The terminal device of claim 8 , wherein the processing unit is configured to:

determine the at least one power control parameter corresponding to the target SRI as the power control parameter for the uplink data.

15. The terminal device of claim 8 , wherein the target SRI is multiple second SRIs of the multiple SRIs, and

the processing unit is further configured to:

determine the power control parameter for the uplink data based on processing of multiple power control parameters corresponding to the multiple second SRs.

16. The terminal device of claim 8 , wherein the at least one power control parameter a path loss value used by the terminal device to determine uplink transmit power, or the at least one power control parameter comprises information of a downlink signal, the information of the downlink signal being used by the terminal device to measure the path loss value for determining the uplink transmit power.

17. The terminal device of claim 8 , wherein the at least one power control parameter comprises at least one of an open-loop power control parameter or a closed-loop power control parameter.

18. The terminal device of claim 8 , wherein the processing unit is configured to:

receive a bitmap sequence sent by a network device, the bitmap sequence comprising multiple bits and the multiple bits being used to indicate the multiple SRIs.

19. The terminal device of claim 18 , wherein each bit in the bitmap sequence indicates a respective SRI of the multiple SRIs;

and the processing unit is further configured to:

determine an SRI corresponding to a first bit indicated to be 1 in the bitmap sequence as the target SRI.

20. The terminal device of claim 8 , wherein the processing unit is further configured to determine the transmit power of the uplink data according to:

P PUSCH,c ( i )=min{ 10log 10 (M PUSCH,c (i))+P 0,c (j)+α c (j)·PL c (k)+Δ TF,c (i)+ƒ c (i,l) P CMAX,c (i), }.

wherein P PUSCH,c (i) represents the transmit power of the uplink data, P 0,c represents a target power, α c (j) represents a path loss factor, PL c (k) represents an estimated path loss value, and ƒ c (i,l) represents a closed-loop power regulation function.